yes, that's where a upside down U shaped hose goes for the overboard smog pump vent. It just vents to the atmosphere.

As far as a print manual, no clue. I've found the factory CD's to be complex and hard to navigate around but have had great luck using ALLDATA. It's the only place I go now for technical information and it's always up to date.

Good luck with the wiring harness, I haven't had to change mine but I understand that it's not that hard to do with some basic mechanical/wiring knowledge. Just a remove and replace item, that from the some of the posts here, sounds like an afternoon project.